The difference in clarity between the two eyes after eyeglasses prescription is usually caused by the error in the prescription of eyeglasses, or the existence of diseases in one eye, such as cataract, fundus lesions, etc. 1. Error in lens prescription: If there is an error in the lens prescription of one of the two eyes during the eyeglass examination, it will lead to a decrease in clarity, thus causing the two eyes to see things differently. 2. Disease in one eye: If one of the eyes has a disease, such as cataract, fundus disease, etc., even if the prescription is accurate, it will lead to inconsistency in the degree of clarity of both eyes. If you have a problem with the clarity of both eyes, you must go to the ophthalmology department of the hospital in time, and the doctor will find out the specific reason through examination.